VEGA VEGAPULS 66 (≥ 2.0.0 - ≤ 3.8) standpipe ver. 4 … 20 mA_HART four-wire - Manual (Page 43)

Influence of the ambient temperature to the sensor electronics 8)
A verage temperature coefficient of the zero
signal (temperature error)
0.03 %/10 K
Influence of the superimposed gas and pressure to the accuracy
T he spreading speed of the radar impulses in gas or vapour above the product is reduced by high
pressures. This effect depends on the superimposed gas or vapour and increases with low
temperatures. The following chart shows the deviation caused by some typical gases or vapours.
T
he stated values refer to the distance. Positive values mean that the measured distance is too
high, negative values that the measured distance is too small.
Gas phase Temperature 1 bar/14.5 psig 10 bar/145 psig 50 bar/725 psig
A ir/Nitrogen 20 °C/68 °F 0.00 % 0.22 % 1.2 %
A ir/Nitrogen 200 °C/392 °F 0.00 % 0.13 % 0.74 %
H ydrogen 20 °C/68 °F -0.01 % 0.10 % 0.61 %
H ydrogen 200 °C/392 °F -0.02 % 0.05 % 0.37 %
W ater (saturated
steam)
100 °C/212 °F 0.20 % - -
W ater (saturated
steam)
180 °C/356 °F - 2.1 % -
Ambient conditions
A mbient, storage and transport temperature -40 … +70 °C (-40 … +158 °F)
Process conditions
F or the process temperature and the vessel pressure, you also have to note the specifications on
the type label! Always the lowest value is applicable!
P rocess temperature (measured on the process fitting depending on process seal
-
FKM (V iton) -40 … +80 °C (-40 … +176 °F)
-
FKM (V iton) with temperature adapter -40 … +150 °C (-40 … +302 °F)
-
FFKM (K alrez 6375) -20 … +150 °C (-4 … +302 °F)
-
graphite (coupling cone ceramic) -60 … +250 °C (-76 … +482 °F)
-
graphite (coupling cone ceramic) with
temperature adapter -60 … +400 °C (-76 … +752 °F)
V essel pressure relating to the antenna cone
-
PTFE -100 … 4000 kPa/-1 … 40 bar (-14.5 … 580 psi)
with PN 40
-
C eramic -100 … 16000 kPa/-1 … 160 bar (-14.5 … 2321 psi)
with PN 160
8) R elating to the nominal measuring range, in the temperature range
-40 … +80 °C .
VEGAPULS 66 standpipe version • 4 … 20 mA/HART four-wire 43
10 S upplement
28742
-EN
-090305